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The purpose of the study on the RWBAT (Regional Water Balance model based on the concept
of the Tank Mode) model is to develop the hydrological model assessing the variation of
water resources and soil moisture over wide area with the spatial resolution of 0.5 x 0.5
degrees in longitude and latitude on a daily basis, when extraordinary fluctuation of
Asian Monsoon activity is occurred or large-scale reclamation is carried out. In this
study, the RWBAT model uses the Tank Models, because the concept of the Tank model is so
simple and presents adequate hydrological response in the basin by using four simple Tanks
lied vertically. Moreover, the Tank model are used in various regions from arid to humid
area and from tropical to snow-covered area. If parameters of Tanks are derived from the
catchment characteristics, such as topography, surface geology and vegetation indexes,
reasonably, the RWBAT model could give precise information for water resources against a
extraordinary weather condition. In this workshop, the outline of the RWBAT model and
applications to the Chaophraya River basin in Thailand and the Huaihe River basin in
China, where the analyzing catchment area is 110 thousand km2 and 121 thousand km2
respectively are presented. The estimations were carried out on daily basis from 1982 to
1985 in the Chaophraya River basin and from 1983 to 1989 in the Huaihee River basin
respectively. These results for river discharge in each river points were reasonable on a
whole, though same parameters of the model were used for the two basins where climate,
topography and vegetation are very different each other.
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